SIST EN 29865:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Tekstilije - Ugotavljanje vodoodbojnosti ploskovnih tekstilij z Bundesmannovim preskusom dežne prheTextilien - Bestimmmung der wasserabweisenden Eigenschaften von Flächengebilden mittels der Beregnungsprüfung nach Bundesmann (ISO 9865:1991)Textiles - Hydrophobicité de tissus a l'aide d'un essai d'arrosage suivant la méthode Bundesmann (ISO 9865:1991)Textiles - Determination of water repellency of fabrics by the Bundesmann rain-shower test (ISO 9865:1991)59.080.30TkanineTextile fabricsICS:Ta slovenski standard je istoveten z:EN 29865:1993SIST EN 29865:1999en01-marec-1999SIST EN 29865:1999SLOVENSKI
STANDARD
INTERNATIONAL STANDARD First edition 1991-12-15 Corrected and reprinted 1992-04-15 Textiles - Determination of water repellency of fabrics by the Bundesmann rain-shower test Textiles - Hydrophobicit de thus 21 /‘aide d’un essai d’arrosage suivant la methode Bundesmann Reference number IS0 9865:1991(E)

IS0 9865:1991(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an lnter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 9865 was prepared by Technical Committee ISO/TC 38, Textiles. 0 IS0 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. international Organization for Standardization Case Postale 56 l CH-1211 Genbve 20 l Switzerland Printed in Switzerland ii

INTERNATIONAL STANDARD IS0 9865:1991(E) Textiles - Determination of water repellency of fabrics by the Bundesmann rain-shower test 1 Scope This International Standard describes a method for the determination of the water repellency of textile fabrics by a rain-shower test known as the Bundesmann method. The test may be used to assess the effectiveness of finishing procedures for rendering textile fabrics water-repellent. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 139: 1973, Textiles - Standard atmospheres for conditioning and testing. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 water repellency: The resistance of textile fab- rics to absorb rain shower water. The criterion is the amount of water absorbed following the effects of a defined artificial rain shower for a specific duration. In addition, the amount of water penetrating the textile fabrics and the water run-off may be re- corded. 4 Principle Test specimens of textile fabrics are mounted on cups and then exposed to an artificial rain shower under defined conditions. The water repellency is assessed by visual comparison of the wet speci- mens with reference photographs. The water ab- sorbed by the specimens during the test is weighed. The water penetrating the specimens is also col- lected in the cups and recorded. 5 Apparatus and materials NOTE 1 The rain shower equipment produces an arti- ficial rain shower defined by water flow, drop size and drop fall height. The rain shower equipment may have one or more devices for holding the specimens. To remove excess water from the specimens, a centrifuge for hori- zontal rotation at a specific speed is used. 5.1 Rain shower equipment,‘) comprising a system of 300 identical drop-forming devices, e.g. nozzles or jets, equally distributed over a circular horizontal surface (area z 1300 cm2) of 406 mm diameter. The approximate diameter of the drop produced by each drop former is 4 mm. Water emerging from the drop former produces a drop of approximately 0,07 ml. The water flow of the rain shower equip- ment can be varied so that the time-related flow of water prescribed for the test can be set to (100 + 5) ml/min for a rain shower surface area of 100 cm? The drop fall height, i.e. the vertical dis- tance between the drop former and the centre of the specimen surface, is 1500 mm. For the rain shower test, normal tap water is used which is passed through a mechanical filter to remove coarse con- tamination. The water temperature is (20 + 3) OC or (27 $- 2) ‘C (the latter for tropical countries). Water temperature, water hardness and pH value shall be measured and recorded in the test report, 1) For details of the source of supply of the rain shower equipment, apply to national standards institutions.

IS0 9865:1991(E) NOTE 2 A flow rate of (100 + 5) ml/min is equivalent to (200 $- 10) ml in 23 min for a surface area of 80 cm*. 5.2 Clamping device for the specimen, having the configuration of a cup to enable the water passing through the specimen to be collected and measured. The top of the cup serves to clamp the specimen in place by means of a clamping ring. Each cup shall have a tap. For thick textile fabrics, the clamping rings used are larger than those used for clamping thin textile fabrics. The exposed area of the clamped specimen is 80 cm 2. The ou
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